Example 1

    uses MtxExpr, Math387, MtxVec, MtxVecTee, MtxVecEdit,
         LinearSystems, IirFilters, SignalUtils;

    procedure TForm1.Button1Click(Sender: TObject);
    var z,p, num,den, FreqFr,Response: Vector;
        Order: integer;
        k,Wc,BW: TSample;
    begin
        Order := 5; //design a fifth order filter.
        EllipticAnalog(Order,0.2,40,z,p,k);  //design analog protype
        Wc := Sqrt(0.2*0.6);
        BW := 0.6-0.2;
        LowpassToBandpass(z,p,k,Wc,BW);  //frequency transformation in s-domain
        ZeroPoleToTransferFun(num,den,z,p,k);
        //Define the frequency grid (logarithmic)
        FreqFr.Length := 1000;
        LogRamp(FreqFr,-1,1); //between 0.1 (=10^(-1)) and 10 (=10^1) rad/sec
        FrequencyResponseS(num,den,FreqFr,Response); //Laplace
        DrawIt(Response); //Y axis linear, X axis logarithmic
    end;

    #include "MtxVecCPP.h" //MtxVecCPP.cpp must be included in the project
    #include "MtxVecEdit.hpp"
    #include "MtxVecTee.hpp"
    #include "SignalUtils.hpp"
    #include "IirFilters.hpp"
    #include "LinearSystems.hpp"

    void __fastcall TForm1::BitBtn1Click(TObject *Sender)
    {
        Vector z,p, num,den, FreqFr,Response;
        int Order;
        double k,Wc,BW;

        Order = 5; //design a fifth order filter.
        EllipticAnalog(Order,0.2,40,z,p,k);  //design analog protype
        Wc = Sqrt(0.2*0.6);
        BW = 0.6-0.2;
        LowpassToBandpass(z,p,k,Wc,BW);  //frequency transformation in s-domain
        ZeroPoleToTransferFun(num,den,z,p,k);
        //Define the frequency grid (logarithmic)
        FreqFr->Length = 1000;
        LogRamp(FreqFr,-1,1); //between 0.1 (=10^(-1)) and 10 (=10^1) rad/sec
        FrequencyResponseS(num,den,FreqFr,Response); //Laplace
        DrawIt(Response); //Y axis linear, X axis logarithmic
    }

  using Dew.Math;
  using Dew.Math.Editors;
  using Dew.Math.Units;
  using Dew.Signal;
  using Dew.Signal.Units;
  using Dew.Math.Tee;
  using Dew.Signal.Tee;

  private void button1_Click(object sender, EventArgs e)
  {
       Vector z = new Vector(0);
       Vector p = new Vector(0);
       Vector num = new Vector(0);
       Vector den = new Vector(0);
       Vector Response = new Vector(0);
       Vector FreqFr = new Vector(0);
       double k,Wc,BW;
       double FS = 2;
       int Order = 5; //design a fifth order filter.

       IIRFilters.EllipticAnalog(Order,0.2,40,z,p,out k);  //design analog protype
       Wc = Math.Sqrt(0.2*0.6);
       BW = 0.6 - 0.2;
       LinearSystems.LowpassToBandpass(z,p,ref k,Wc,BW);  //frequency transformation in s-domain
       LinearSystems.ZeroPoleToTransferFun(num,den,z,p,k);
    //Define the frequency grid (logarithmic)
       FreqFr.Length = 1000;
       SignalUtils.LogRamp(FreqFr,-1,1); //between 0.1 (=10^(-1)) and 10 (=10^1) rad/sec
       SignalUtils.FrequencyResponseS(num,den,FreqFr,Response,0); //Laplace
       TeeChart.DrawIt(Response,"Frequency response",false); //Y axis linear, X axis logarithmic
  }

          s^2 + Wu*Wl
  s --> -------------
          s(Wu - Wl)

  Wl - lower cutoff frequency
  Wu - upper cutoff frequency